题目内容

在因特网中（不考虑NAT），IP分组从源主机到目的主机可能要经过多个网络和路由器。假设在传输过程中IP分组没有误码，其首部中的

A. 源IP地址和目的IP地址都不会发生变化
B. 源IP地址有可能发生变化而目的IP地址不会发生变化
C. 源IP地址不会发生变化而目的IP地址有可能发生变化
D. 源IP地址和目的IP地址都有可能发生变化

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Under normal wind conditions we would want to keep the airplane in a tail low attitude, but in a crosswind we want to bring the tail up to a near____flight attitude.

A. bank
B. level
C. nose-up
D. nose-down

Just as we reach liftoff speed, apply very slight backpressure on the control stick and move the ailerons to a____position.

A. neutral
B. up
C. down
D. takeoff

There, we’ve just lifted off the runway and we’re now____.

A. descending
B. leveling
C. airborne
D. departing

After____, relax the backpressure on the control stick and relax the rudder pressure you have been holding during the takeoff roll.

A. lifting off
B. taxiing
C. pushing back
D. landing